feat(2.0): Phase 0 — Greenfield-Skeleton (FastAPI + React/shadcn)

Backend: FastAPI mit /api/health + /api/models (read-only aus llama-swap
config, Logik aus v1 portiert). Frontend: Vite + React + Tailwind v4 +
shadcn-Style App-Shell mit Cmd+K, Dark-default, PWA-Manifest; Modelle-View
live aus /api/models. Deploy-Geruest (systemd-Unit :9001, build/deploy-
Skripte, NOPASSWD-sudoers, kein Klartext-Passwort).

Verifiziert: Backend-Endpunkte + Frontend-Build + gerenderte Shell.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from "vite"
+import react from "@vitejs/plugin-react"
+import tailwindcss from "@tailwindcss/vite"
+import path from "node:path"
+
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  resolve: {
+    alias: { "@": path.resolve(__dirname, "./src") },
+  },
+  server: {
+    proxy: {
+      // Dev: /api → FastAPI-Backend
+      "/api": { target: "http://127.0.0.1:9000", changeOrigin: true },
+    },
+  },
+  build: { outDir: "dist" },
+})